LOL nodes are a strange thing as what looks complex to one person may look basic to another. The Fresnel group above requires a bit more math and the Tutorial I was watching about it explained as straightforward and basic, but took me a while to get the maths of it. A lot of times it can takes years to learn how to make up node groups. The model comes from a group called Mastering CGI who offer courses in shaders etc mainly for maya though. And the model serves no purpose other than to display the node set ups. The noise in the image is there as it is a preview render at 32 samples

Incantrix